For an ICAO racetrack procedure turn entry, what is the teardrop timing?

In an ICAO racetrack procedure turn entry, the concept of "teardrop timing" is essential for correctly executing the maneuver. The teardrop entry is characterized by a specific timing to ensure that the aircraft correctly intercepts the outbound leg of the procedure after the initial turn.

1.5 minutes represents the timing interval that ensures the aircraft can safely position itself to rejoin the racetrack pattern. This timing is derived from general guidelines for racetrack procedures, which take into account the standard speed and separation requirements for aircraft. By using 1.5 minutes for the teardrop leg, pilots are given a proper allowance to transition from the initial turn towards the parallel leg safely and efficiently, thereby optimizing the turn radius and ensuring compliance with airspace requirements.

Using other time intervals like one minute or two minutes can result in either arriving too soon or too late to the outbound leg, which could jeopardize the integrity of the procedure and lead to complications in navigation. Thus, the selection of 1.5 minutes is crucial for maintaining situational awareness and adherence to operational standards during the maneuver.